18979898344 has 24 divisors (see below), whose sum is σ = 39116631330. Its totient is φ = 8627226080.

The previous prime is 18979898299. The next prime is 18979898351. The reversal of 18979898344 is 44389897981.

It can be written as a sum of positive squares in only one way, i.e., 17921176900 + 1058721444 = 133870^2 + 32538^2 .

It is a super-2 number, since 2×18979898344² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9802699 + ... + 9804634.

Almost surely, 2^18979898344 is an apocalyptic number.

It is an amenable number.

18979898344 is an abundant number, since it is smaller than the sum of its proper divisors (20136732986).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18979898344 is a wasteful number, since it uses less digits than its factorization.

18979898344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19607361 (or 19607346 counting only the distinct ones).

The product of its digits is 125411328, while the sum is 70.

The spelling of 18979898344 in words is "eighteen billion, nine hundred seventy-nine million, eight hundred ninety-eight thousand, three hundred forty-four".